Orthostatic proteinuria occurs due to changes in which factor?

Orthostatic proteinuria is a condition characterized by the presence of protein in the urine that occurs when a person is in an upright position, such as standing or sitting, and typically resolves when the person is lying down. The key factor influencing this condition is posture. When a person stands up, gravity affects blood flow and kidney function, which may increase the amount of protein that leaks into the urine.

This phenomenon is most commonly observed in adolescents and young adults and is generally benign, meaning it does not indicate any serious underlying kidney disease. During the supine position, there is less pressure on the kidneys, leading to normal protein levels in the urine. Therefore, the primary reason for orthostatic proteinuria is indeed related to changes in position or posture.